为了提取机车滚动轴承早期损伤类故障特征，本文提出了一种双重小波平均谱方法，并通过诊断实例验证了方法的有效性。
To extract early fatigue feature of engine bearings, the paper presents an average spectrum method with double-wavelet and the diagnosis examples are used to show the validity of the method.
广谱高效，具有灭虫杀菌双重效果，对肠道有修复作用，不会产生呕吐现象，不影响赛鸽竞翔体能。
Extensive and high efficiency, with the dual effect of pest control and sterilization, repairing effect of intestines, no vomiting, no affecting the flying physical ability of racing pigeons.
广谱高效，具有灭虫杀菌双重效果，对肠道有修复作用，不会产生呕吐现象，不影响赛鸽竞翔体能。
Extensive and high efficiency, with the dual effect of pest control and sterilization, repairing effect of intestines, no vomiting, no affecting the flying physical ability of racing pigeons.
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